1,1

Among terms are all the squares for which discriminant = 1

Table of n, a(n) for n=1..59.

a(n) appears to be asymptotic to C*n with C=3.4.....

(PARI) isok(m) = quaddisc(m) < m; \\ Michel Marcus, Feb 18 2021

Cf. A037449, A072904.

Sequence in context: A313317 A292674 A313318 * A336919 A313319 A313320

Adjacent sequences: A072900 A072901 A072902 * A072904 A072905 A072906

easy,nonn

Benoit Cloitre, Aug 10 2002

approved